I would love to make a roof vent, but there are too many things preventing me from doing it (tile roofing, ect.).

I look into drywall, is it expensive? We have homes being built all around us right now so I went and got some 2x4s out of the dumpster (if I didn't have morals I would just grab some 4'x8' plywood and build a area up there) and am using blue tarps to make walls. It is really hard to move around as the area I climb up through is 1' tall and I have to crawl 5 ft to get to those photo areas, so thats why I am using 2x4s and blue tarp.